Riverine CO2supersaturation and outgassing in a subtropical monsoonal mountainous area (Three Gorges Reservoir Region) of China
文献类型：期刊论文
| 作者 | Li, Siyue1 ; Ni, Maofei1,2; Mao, Rong1; Bush, Richard T.3
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| 刊名 | Journal of Hydrology
 |
| 出版日期 | 2018 |
| 卷号 | 558页码:460-469 |
| ISSN号 | 00221694 |
| DOI | 10.1016/j.jhydrol.2018.01.057 |
| 英文摘要 | Rivers are an important source of CO2to the atmosphere, however, mountainous rivers and streams with high emission rates are not well studied particularly in China. We report the first detailed investigation on monsoonal mountainous rivers in the Three Gorges Reservoir (TGR) region, with a focus on the riverine CO2partial pressure (pCO2), CO2degassing and their potential controls. The pCO2levels ranged from 50 to 6019 µatm with averages of 1573 (SD. ±1060) in dry Autumn and 1276 (SD. ±1166) µatm in wet Summer seasons. 94% of samples were supersaturated with CO2with respect to the atmospheric equilibrium (410 µatm). Monsoonal precipitation controlled pCO2seasonality, with both the maximal and minimal levels occurring in the wet season, and showing the overall effects of dilution. Riverine pCO2could be predicted better in the dry season using pH, DO% and DTP, whereas pH and DOC were better predictors in the wet season. We conclude that in-situ respiration of allochthonous organic carbon, rather than photosynthesis, resulted in negative relationships between pCO2and DO and pH, and thus CO2supersaturation. Photosynthetic primary production was effectively limited by rapid flow velocity and short residence time. The estimated water-to-air CO2emission rate in the TGR rivers was 350 ± 319 in the Autumn and lower, yet more variable at 326 ± 439 mmol/m2/d in Summer. Our calculated CO2areal fluxes were in the upper-level magnitude of published data, demonstrating the importance of mountainous rivers and streams as a global greenhouse gas source, and urgency for more detailed studies on CO2degassing, to address a global data gap for these environments. © 2018 Elsevier B.V. |
| 语种 | 英语 |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/7994]  |
| 专题 | 生态水文研究中心 |
| 作者单位 | 1.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing; 400714, China; 2.University of Chinese Academy of Sciences, Beijing; 100049, China; 3.International Centre for Balanced Land Use, Newcastle Institute for Energy & Resources, The University of Newcastle, NSW; 2308, Australia |
| 推荐引用方式 GB/T 7714 | Li, Siyue,Ni, Maofei,Mao, Rong,et al. Riverine CO2supersaturation and outgassing in a subtropical monsoonal mountainous area (Three Gorges Reservoir Region) of China[J]. Journal of Hydrology,2018,558:460-469. |
| APA | Li, Siyue,Ni, Maofei,Mao, Rong,&Bush, Richard T..(2018).Riverine CO2supersaturation and outgassing in a subtropical monsoonal mountainous area (Three Gorges Reservoir Region) of China.Journal of Hydrology,558,460-469. |
| MLA | Li, Siyue,et al."Riverine CO2supersaturation and outgassing in a subtropical monsoonal mountainous area (Three Gorges Reservoir Region) of China".Journal of Hydrology 558(2018):460-469. |
入库方式： OAI收割
来源：重庆绿色智能技术研究院
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